In article , YAPH
writes
I take it that was the plate heat exchanger (sort of brick-like metal
block with 4 holes or pipes on it)?
No, it was a metal cylinder (like a drinks can on steroids)
Silt = black gritty/flakey crud?
Yes, larger grains than sand, black, quite loose, not adhering to
anything at all.
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(='.'=) Bunny says Windows 7 is Vi$ta reloaded.
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http://imgs.xkcd.com/comics/windows_7.png